Question

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Answer 1

Explanation:

In series combination

Rs = R1 + R2

90 = R1 + R2

R2 = 90-R1

In parallel combination

1/Rs = 1/R1 + 1/R2

1/20 = (R2+ R1) / (R1.R2)

1/20 = 90 / (R1.R2)

R1.R2 = 1800

R1 (90-R1) = 1800

R1 = 60 or 30

R2 = 30 or 60

Answer 2

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